Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
AHRT
4576
PUT
AH Realty Trust
AHRT
$536M
| $162K | ﹤0.01% |
15,900
+6,200
| +64% | +$72K |
|
4577
Ameresco
AMRC
$980M
| $162K | ﹤0.01% |
+4,206
| New | +$203K |
|
4578
Breakwave Dry Bulk Shipping ETF
BDRY
$28.1M
| $162K | ﹤0.01% |
29,521
+19,935
| +208% | +$102K |
|
4579
CALL
Churchill Downs
CHDN
$6.17B
| $162K | ﹤0.01% |
+1,400
| New | +$173K |
|
4580
CALL
Consolidated Water Co
CWCO
$472M
| $162K | ﹤0.01% |
5,700
+3,200
| +128% | +$78.9K |
|
4581
CALL
Expensify
EXFY
$174M
| $162K | ﹤0.01% |
50,100
+49,400
| +7,057% | +$267K |
|
4582
CALL
HighPeak Energy
HPK
$838M
| $162K | ﹤0.01% |
9,600
-5,200
| -35% | -$75.5K |
|
4583
CALL
Innodata
INOD
$1.81B
| $162K | ﹤0.01% |
19,100
+1,000
| +6% | +$11.2K |
|
4584
Invesco Mortgage Capital
IVR
$759M
| $162K | ﹤0.01% |
16,204
-9,140
| -36% | -$101K |
|
4585
Murphy Oil
MUR
$5.55B
| $162K | ﹤0.01% |
3,591
-1,314
| -27% | -$57.2K |
|
4586
PUT
Qfin Holdings
QFIN
$1.68B
| $162K | ﹤0.01% |
10,600
-1,200
| -10% | -$20.5K |
|
4587
Petco
WOOF
$797M
| $162K | ﹤0.01% |
+39,628
| New | +$261K |
|
4588
PUT
Arrowhead Research
ARWR
$12.1B
| $161K | ﹤0.01% |
6,000
-19,100
| -76% | -$585K |
|
4589
Cullen/Frost Bankers
CFR
$10.5B
| $161K | ﹤0.01% |
+1,766
| New | +$179K |
|
4590
CALL
Intrepid Potash
IPI
$476M
| $161K | ﹤0.01% |
6,400
-10,000
| -61% | -$256K |
|
4591
McEwen Inc
MUX
$1B
| $161K | ﹤0.01% |
+24,898
| New | +$188K |
|
|
VRNA
4592
PUT
DELISTED
Verona Pharma
VRNA
| $161K | ﹤0.01% |
9,900
+7,200
| +267% | +$139K |
|
4593
W.R. Berkley
WRB
$28.1B
| $161K | ﹤0.01% |
3,815
-2,845
| -43% | -$118K |
|
|
ARVL
4594
PUT
DELISTED
Arrival Ordinary Shares
ARVL
| $161K | ﹤0.01% |
135,700
-1,700
| -1% | -$3.04K |
|
4595
CALL
Apogee Enterprises
APOG
$833M
| $160K | ﹤0.01% |
3,400
+2,500
| +278% | +$121K |
|
4596
PUT
Algonquin Power & Utilities
AQN
$4.59B
| $160K | ﹤0.01% |
27,100
-283,100
| -91% | -$2.13M |
|
4597
CALL
Bakkt Inc
BKKT
$306M
| $160K | ﹤0.01% |
5,476
-2,612
| -32% | -$92.5K |
|
4598
CALL
Camden Property Trust
CPT
$11.5B
| $160K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$170K |
|
4599
CALL
MiMedx Group
MDXG
$630M
| $160K | ﹤0.01% |
22,000
-9,800
| -31% | -$73K |
|
4600
PUT
Appian
APPN
$2.11B
| $159K | ﹤0.01% |
3,500
-2,300
| -40% | -$110K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.